physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
Causes of Painful Gums. Canker Sores Canker sore is a small ulcer crater in the lining of the mouth. Canker sores are one of the most common problems that occur in...learn more Â». Gum Disease Gum disease is caused by plaque and may result in tooth loss without proper treatment.